1989 Tiananmen Square protests and massacre

Liu Xiaobo

Liu Xiaobo (Chinese: 刘晓波; pinyin: Liú Xiǎobō; 28 December 1955 – 13 July 2017) was a Chinese literary critic, human rights activist, philosopher and Nobel Peace Prize laureate who called for political reforms and was involved in campaigns to end Chinese Communist Party one-party rule in China.

Leonardo da Vinci

Leonardo di ser Piero da Vinci (15 April 1452 – 2 May 1519) was an Italian polymath of the High Renaissance who was active as a painter, draughtsman, engineer, scientist, theorist, sculptor, and architect.

Photo: Attributed to Francesco Melzi · Public domain

Leonhard Euler

Leonhard Euler ( OY-lər; 15 April 1707 – 18 September 1783) was a Swiss polymath who was active as a mathematician, physicist, astronomer, logician, geographer, music theorist and engineer.

Photo: Jakob Emanuel Handmann · Public domain

Kim Il-sung

Kim Il Sung (born Kim Song Ju; 15 April 1912 – 8 July 1994) was a North Korean communist revolutionary, military officer, politician, and dictator who founded the Democratic People's Republic of Korea (DPRK), also known as North Korea, in 1948, and led it until his death in 1994.

Photo: Unknown author · Public domain

Émile Durkheim

David Émile Durkheim (French: or; 15 April 1858 – 15 November 1917) was a French sociologist. He formally established the academic discipline of sociology and is commonly cited as one of the principal architects of modern social science, along with Karl Marx and Max Weber.

Photo: Unknown author · Public domain